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Elements with 7 electrons in their outermost energy levels are most likely halogens. This is group 17 (or 7A) on the periodic table, and they include the common and highly reactive elements fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).

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The Halogen family elements have how many valence electrons?

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What is highly reactive family of elements with 7 valence electrons?

halogen